question: What sentence would provide a factual answer to this question: "What is an example of combining"

answer: An example of combining two substances is pouring one substance into the other substance


question: What sentence would provide a factual answer to this question: "A radio is used for what?"

answer: a radio is used for communication


question: What sentence would provide a factual answer to this question: "Dropping butter into a boiling water would cause it to"

answer:
melting means changing from a solid into a liquid by adding heat energy